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25 April 2024

» arxiv » astro-ph/0512226

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Water maser motions in W3(OH) and a determination of its distance
K. Hachisuka ; A. Brunthaler ; K. M. Menten ; M. J. Reid ; H. Imai ; Y. Hagiwara ; M. Miyoshi ; S. Horiuchi ; T. Sasao ;
Date:	8 Dec 2005
Abstract:	We report phase-referencing VLBA observations of H2O masers near the star-forming region W3(OH) to measure their parallax and absolute proper motions. The measured annual parallax is 0.489 +/- 0.017 milli-arcseconds (2.04 +/- 0.07 kpc), where the error is dominated by a systematic atmospheric contribution. This distance is consistent with photometric distances from previous observations and with the distance determined from CH3OH maser astrometry presented in a related paper. We also find that the source driving the H2O outflow, the ``TW-object’’, moves with a 3-dimensional velocity of > 7 km/s relative to the ultracompact HII region W3(OH).
Source:	arXiv, astro-ph/0512226
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